At one point in Avengers: Infinity War, Black Widow (Scarlett Johansson) said that Hawkeye and Ant-Man had both taken deals with the government after they were arrested (along with the rest of Captain America’s crew) in Captain America: Civil War. While Captain America, Falcon, Black Widow and Scarlet Witch presumably went into hiding, the two dads—Hawkeye and Ant-Man—turned themselves into the government so they could be with their families.

So that’s where we find Ant-Man in Ant-Man and the Wasp, which takes place between Captain America: Civil War but before the events of Avengers: Infinity War. Fans learn that Scott Lang took the Ant-Man suit from his mentor Hank Pym (Michael Douglas) without permission when he flew to Germany to help Captain America (Chris Evans) fight Iron Man (Robert Downey Jr.) in Civil War. Scott also violated his parole. Since he returned from Germany, he’s been under house arrest for two years.

In order to make amends with Hank, Scott secretly helps Hank and his daughter Hope (Evangeline Lilly’s The Wasp) save Hope’s mother, Janet Van Dyne (Michelle Pfeiffer) from the quantum realm, where she got trapped during a mission 30 years ago. All is resolved with no hint that Thanos has yet attacked Earth.

Paul Rudd and Evangeline Lilly in “Ant-Man and the Wasp”.

Marvel Studios

But the movie’s first end-credits scene seems to take place the day that Thanos snapped his fingers and destroyed half of all life in the universe. Scott, Hope, Hank and Janet are working on an experiment, seemingly blissfully unaware of the impending doom. Scott shrinks down to a tiny size in order to enter the Quantum Realm and retrieve samples. But while he is in the Quantum Realm, he loses contact with the Pym family.

The camera cuts to where the Pyms were standing, and all we see is dust. Like dozens of characters in Avengers: Infinity War, they have disintegrated and floated away. Scott is stuck in the Quantum Realm.

Why didn’t the Avengers call Scott when they first saw Thanos’ cronies land on earth? Maybe they thought he was still under house arrest. Or maybe Scott isn’t as essential to the Avengers team as he thinks. (Hope makes fun of Scott for calling Captain America by the nickname “Cap” throughout the movie.) Or maybe there simply wasn’t time to alert him.

But we do know that Ant-Man won’t be of much help in Avengers 4 until someone finds him in the Quantum Realm and brings him back. Maybe Captain Marvel can assist with that.